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Search: id:A115367
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| A115367 |
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Row sums of correlation triangle for Fredholm-Rueppel sequence A036987. |
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+0
2
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| 1, 2, 2, 4, 4, 4, 5, 6, 7, 6, 9, 6, 9, 6, 10, 8, 12, 8, 14, 8, 14, 8, 16, 8, 16, 8, 16, 8, 16, 8, 17, 10, 19, 10, 21, 10, 21, 10, 23
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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If a sequence has g.f. A(x), its correlation triangle has g.f. A(x)A(x*y)/(1-x^2*y). (Observation due to Christian G. Bower).
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FORMULA
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G.f. : (sum{k>=0, x^(2k-1)})^2/(1-x^2); a(n)=sum{k=0..n, sum{j=0..k, A036987(j)}*sum{j=0..n-k, A036987(j)*(-1)^(n-k-j)}}.
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CROSSREFS
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Sequence in context: A101656 A090557 A035660 this_sequence A084841 A144202 A157887
Adjacent sequences: A115364 A115365 A115366 this_sequence A115368 A115369 A115370
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jan 21 2006
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